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templates.go
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templates.go
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package web
import (
"bufio"
"fmt"
"html/template"
"io"
"io/fs"
"path"
"path/filepath"
"regexp"
"strings"
"sync"
"github.com/tdewolff/minify"
"github.com/ethpandaops/assertoor/pkg/coordinator/web/utils"
)
var templateFiles fs.FS
var templateCache = make(map[string]*template.Template)
var templateCacheMux = &sync.RWMutex{}
var templateFuncs = utils.GetTemplateFuncs()
func GetTemplate(files ...string) *template.Template {
name := strings.Join(files, "-")
templateCacheMux.RLock()
if templateCache[name] != nil {
defer templateCacheMux.RUnlock()
return templateCache[name]
}
templateCacheMux.RUnlock()
tmpl := template.New(name).Funcs(templateFuncs)
tmpl = template.Must(parseTemplateFiles(tmpl, readFileFS(templateFiles), files...))
templateCacheMux.Lock()
defer templateCacheMux.Unlock()
templateCache[name] = tmpl
return templateCache[name]
}
func readFileFS(fsys fs.FS) func(string) (string, []byte, error) {
return func(file string) (name string, b []byte, err error) {
name = path.Base(file)
b, err = fs.ReadFile(fsys, file)
if frontendConfig.Minify {
// minfiy template
m := minify.New()
m.AddFunc("text/html", minifyTemplate)
b, err = m.Bytes("text/html", b)
if err != nil {
panic(err)
}
}
return
}
}
func minifyTemplate(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
// remove newlines and spaces
m1 := regexp.MustCompile(`([ \t]+)?[\r\n]+`)
m2 := regexp.MustCompile(`([ \t])[ \t]+`)
rb := bufio.NewReader(r)
for {
line, err := rb.ReadString('\n')
if err != nil && err != io.EOF {
return err
}
line = m1.ReplaceAllString(line, "")
line = m2.ReplaceAllString(line, " ")
if _, errws := io.WriteString(w, line); errws != nil {
return errws
}
if err == io.EOF {
break
}
}
return nil
}
func parseTemplateFiles(t *template.Template, readFile func(string) (string, []byte, error), filenames ...string) (*template.Template, error) {
for _, filename := range filenames {
name, b, err := readFile(filename)
if err != nil {
return nil, err
}
if t == nil {
t = template.New(name)
}
var tmpl *template.Template
if name == t.Name() {
tmpl = t
} else {
tmpl = t.New(name)
}
_, err = tmpl.Parse(string(b))
if err != nil {
return nil, err
}
}
return t, nil
}
func GetTemplateNames() []string {
files, _ := getFileSysNames(templateFiles, ".")
return files
}
func CompileTimeCheck(fsys fs.FS) error {
files, err := getFileSysNames(fsys, ".")
if err != nil {
return err
}
template.Must(template.New("layout").Funcs(templateFuncs).ParseFS(templateFiles, files...))
logger.Infof("compile time check completed")
return nil
}
func getFileSysNames(fsys fs.FS, dirname string) ([]string, error) {
files := make([]string, 0, 100)
entry, err := fs.ReadDir(fsys, dirname)
if err != nil {
return nil, fmt.Errorf("error reading embed directory, err: %w", err)
}
for _, f := range entry {
info, err := f.Info()
if err != nil {
return nil, fmt.Errorf("error returning file info err: %w", err)
}
if !f.IsDir() {
files = append(files, filepath.Join(dirname, info.Name()))
} else {
names, err := getFileSysNames(fsys, info.Name())
if err != nil {
return nil, err
}
files = append(files, names...)
}
}
return files, nil
}